mirror of
https://github.com/ClickHouse/ClickHouse.git
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139 lines
3.0 KiB
C
139 lines
3.0 KiB
C
/*
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https://github.com/ncopa/su-exec
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The file is copy-pasted verbatim to avoid supply chain attacks.
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The MIT License (MIT)
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Copyright (c) 2015 ncopa
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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*/
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/* set user and group id and exec */
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#include <sys/types.h>
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#include <err.h>
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#include <errno.h>
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#include <grp.h>
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#include <pwd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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static char *argv0;
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static void usage(int exitcode)
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{
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printf("Usage: %s user-spec command [args]\n", argv0);
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exit(exitcode);
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}
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int main(int argc, char *argv[])
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{
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char *user, *group, **cmdargv;
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char *end;
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uid_t uid = getuid();
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gid_t gid = getgid();
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argv0 = argv[0];
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if (argc < 3)
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usage(0);
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user = argv[1];
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group = strchr(user, ':');
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if (group)
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*group++ = '\0';
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cmdargv = &argv[2];
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struct passwd *pw = NULL;
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if (user[0] != '\0') {
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uid_t nuid = strtol(user, &end, 10);
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if (*end == '\0')
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uid = nuid;
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else {
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pw = getpwnam(user);
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if (pw == NULL)
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err(1, "getpwnam(%s)", user);
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}
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}
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if (pw == NULL) {
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pw = getpwuid(uid);
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}
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if (pw != NULL) {
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uid = pw->pw_uid;
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gid = pw->pw_gid;
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}
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setenv("HOME", pw != NULL ? pw->pw_dir : "/", 1);
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if (group && group[0] != '\0') {
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/* group was specified, ignore grouplist for setgroups later */
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pw = NULL;
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gid_t ngid = strtol(group, &end, 10);
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if (*end == '\0')
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gid = ngid;
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else {
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struct group *gr = getgrnam(group);
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if (gr == NULL)
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err(1, "getgrnam(%s)", group);
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gid = gr->gr_gid;
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}
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}
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if (pw == NULL) {
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if (setgroups(1, &gid) < 0)
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err(1, "setgroups(%i)", gid);
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} else {
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int ngroups = 0;
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gid_t *glist = NULL;
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while (1) {
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int r = getgrouplist(pw->pw_name, gid, glist, &ngroups);
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if (r >= 0) {
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if (setgroups(ngroups, glist) < 0)
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err(1, "setgroups");
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break;
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}
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glist = realloc(glist, ngroups * sizeof(gid_t));
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if (glist == NULL)
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err(1, "malloc");
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}
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}
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if (setgid(gid) < 0)
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err(1, "setgid(%i)", gid);
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if (setuid(uid) < 0)
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err(1, "setuid(%i)", uid);
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execvp(cmdargv[0], cmdargv);
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err(1, "%s", cmdargv[0]);
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return 1;
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}
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